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Windows WN11-SO-000205

DISA STIG WN11-SO-000205 (CAT I): The LanMan authentication level must be set to send NTLMv2 response only, and to refuse LM and NTLM.

DISA STIG recommends

WN11-SO-000205 CAT I

The LanMan authentication level must be set to send NTLMv2 response only, and to refuse LM and NTLM.

NIST SP 800-53: CM-6

Check

If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Control\Lsa\ Value Name: LmCompatibilityLevel Value Type: REG_DWORD Value: 5

Fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: LAN Manager authentication level" to "Send NTLMv2 response only. Refuse LM & NTLM".

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